Comment by patio11

This is a hard thing to debug from outside the Googleplex, but you are currently serving a canonical tag:

<link rel="canonical" href="http://blog.mavnn.co.uk/type-providers-from-the-ground-up">

for a URL which cannot possibly return an HTTP 200. (It 301s to a URL with a / on the end.)

This combination could cause Google to conclude that you have no page which requires inclusion in their main index.